Steam-boiler.



'PATENTED DEC. .25, 190.6.

N. MAONIOOLL STEAM BOILER. l

IPPLIOATION FILED BBB. 28; 1906.

THE NORRI5 PETERS cu, WASHINGTON, n, c.

, No."839,l66. PATBNTED 1130.25,- 1906. I

N. MAONIGOLLa. STEAM BOILER, APPLICATION FILED PER 28, 1906- 2 SHEETS-83111112.

THE NORRIS rsrnzs cm, wumxnnuv. a. c.

unrrnn I srArns PATENT ornron.

NICO'L M AcNIGOLL, or GLASGOW, SCOTLAND.

STEAM-BOILER}.

Specificationof Letters Patent.

Patented Decr25, 1906'.

Application filed February 28, 1906. Serial No. 303,505.

tion, such as will enable others skilled in the art to which it appertains to make and use the same.

invention, which relates to improvements in steam-boilers where water-spaces are arranged. below and above or at the sides of the furnaces or tubes, has for its object to form steam-space extending to' the sides of the boiler below water-level extra to the steam-space above water-level by shutting off the water from part of these water-spaoes and. using the spaces so formed as steamspaces.

In carrying my invention into practice in a two or more furnace Scotch or return-flue boiler I connect the furnace-tubes together water-tight by a longitudinal plate secured in position immediately below the fire-bars and made water-tight at the front end with the front of boiler and at back end either to a transverse plate at the back of the combustion-chamber or to a bulkhead connected water-tight to the under part of the combustion-chamber and shell of the boiler, and a plate at either side connects the said furnacetubes at thesame level and at opposite points with the outside shell of the boiler or with partition-plates designed for this purpose rising above the water-level. It will be under stood that the position of these'plates relative with the furnace-tubes and shell of the boiler will by shutting off the water leave spaces which I connect by pipe or otherwise with the steam-space above the water-level. The improvements apply to existing boil ers as well as to new ones to be constructed.

In the old method the water occupying the spaces beneath the furnace-bars needed some aid to cause circulation and prevent unequal expansion, and sometimes, steam-space being insufiicient', steam chests or domes have to be added external to the boiler. With my improvements these requirements do not exist, and, among others, I obtain the following advantages, viz: I obtain additional steamspace with same dimension of boiler, reduc ing the tendency to priming to a minimum and reducing the weight of water contained with the water in the boiler.

the boiler.

in the boiler, lessening draft of water below same in a steamer, often of consequence in a small vessel with engines aft, either permitting of more dead-weight being carried or lines made finer for speed or allowing a higher water-level and additional heating-surface or allowing the fitting of feed-water spacessay in large stay-tubes near thetop of the boiler also lessening the inner surface of the outside plating liable to gutting through contact can be raised more quickly without straining the boiler, either with or without blowing steam from another boiler into the extra steam-spaces gained. Also the draft through the fire-bars will be heated, owing to the bottom of the furnacebeing heated by the steam conducted below it.

In the accompanying drawings, Figure I is .a longitudinal vertical section of a cylindrical marine return-tube boiler with two furnaces.

Fig. 2 is a longitudinal section taken through the longitudinal dished plates, the upper one of which runs partly between the furnaces and partly between the combustion-chambers and the lower partly between the fur- Further, steam I naces and shell of the boiler and partly between the combustion-chamber and shell of Fig. 3 is a halftransverse verticalsection taken through the combustionchamber on the right-hand side thereof and a half transverse vertical section taken" through the tubes and furnace at the lefthand side thereof. Fig. 4' is a part transverse vertical section illustrating a modified arrangement of my improvements, all hereinafter more fully referred to and described.

In carrying my invention into practice, with reference to Figs. 1 and 2, I carry a curved dish-plate a (but which in some cases may be straight or in segments) between the combustion-chamber b and the back 0 of the boiler. The said dished plate a is dished at the ends and connected to the shell 8 of the boiler, and I butt onto the said dished platea other dished plates d (1 (1 running longitudinally on the sides of the furnaces k and combustion-chamber I) and connected to them and at outside connected to the shell of the boiler and butted and connected to the front either by riveting and calking, packing, or

otherwise, orthe longitudinal dished plates d d d aforesaid may be run to the back 0 of the boiler and the transverse dished plate a butted to them in segments. By this arof the boiler to the steam-spaces e at the bottom thereof by means of the vertical pipes g 9, open to the steam at top and bottom or otherwise inside of boiler, or, if preferred, by means of external pipes.

The partition-plate marked 71, (shown in that the plates dividing the water from the steam-spaces may be made thin, having the same pressure of steam at each side and having, with their jointings, only to stand the few pounds of pressure due to the head of water above and some small additional strains due to the expansion under heat of the parts they are connected to.

I claim- 1. In combination with a steam-boiler, means for separating a shell into two conipartments for forming a steam-chamber be low the contained water, and means forming a communicating conduit between said Fig. 8) constitutes an alternative method steam-chamber and the space above waterwhich in practice only requires to be connected to the furnace 7c or furnaces and combustion-chamber b abreast of same and gives additional steam-spaces right up to the water-level w w, if required, and can be used instead of pipes for connecting the upper and lower steam-spacesf and e.

In Fig. 4 there is illustrated a construction arranged to provide a steam space or spaces 6, as before, by the curved plate i, formed either of one piece or preferably of segments capable of being introduced through the manhole and connected-only to the shell 8 and front of boiler c and back 0 thereof or wholly to the shell, if preferred. The said plate 1 is made to lie close up to the bottom of the furnaces 7c and combustion-chamber b. The steam-space 6 may be connected to the upper steam-space (not shown) by pipes or level, said. steam-chamber extending at the bottom of said shell beneath the boiler-furnace, substantially as described.

2. In a steam-boiler, the combination with the shell and furnace, of means coo )erating therewith for forming a water-tight connec tion between the sides of said furnace and saidshell for forming a steam-chamber below said furnace, and means forming a co1nmunicating conduit between said stean1-chamber and the steam-space formed above waterlevel, substantially as described.

3. In a steam-boiler, the combination with a shell and a plurality of furnaces therein, of means for forming a steam-chamber between said furnaces and shell, comprising longitudinal plates disposed between said furnaces and shell and between said furnaces, and means for forming a communicating conduit between said steam-chamber and the steamspace above water-level, substantially as described.

In testimony whereof I al'lix my signature in presence of two witnesses.

NICOL MAGNICOLL.

Witnesses;

JNo. FADZEAN, JOSEPH HENRY PEARSON. 

